USING REFERENCE ANGLES TO EVALUATE TRIGONOMETRIC FUNCTIONS

How do you evaluate trigonometric functions in the four quadrants, using reference angles. Watch this video to learn! I am a math educator and through this simple technique, you will learn how easy it is to evaluate say , cosec 1450 or any other value. You will learn the concept of A S T C or “ALL STUDENTS TAKE COFFEE” or any other phrase of your choice.

TRIGONOMETRIC SUM AND DIFFERENCE OF ANGLES

Do you want to get over your phobia of trigonometry? This video can help! In this video we will discuss:

1. The sum and difference of trigonometric functions

2. Basic identities and formulas

i. sin(A +B); sin (A-B); cos (A+B); cos (A-B); tan (A+B); tan (A-B)

ii. sin (A+B)sin (A-B) and cos (A+B) .cos (A-B)

iii. how products of the form 2 sin A cos B can be converted into a sum or difference

DOMAIN AND RANGE OF TRIGONOMETRIC FUNCTIONS

Here, you will learn how to determine the domain and range for the 6 trig functions, sine, cosine, tan, sec, cosec and cot. Simple sketches are drawn for you to understand it graphically.

A very useful topic to understand ,especially, if you need to understand the domain and range of inverse trig functions.